" The total OPEC+ deal was for 9.7 million barrels a day reduction, of which Russia and Saudi Arabia would each contribute 2.5 million barrels. Now they were on absolute parity—an agreed baseline of eleven million barrels a day each, which would go down for each to 8.5 million barrels. The other twenty-one members of OPEC-Plus agreed to their own cutbacks. So did other major non-OPEC producers that were not part of OPEC-Plus—Brazil, Canada, and Norway. But these reductions would include declines driven by economics, and those were already occurring. The deal itself was historic, both for the number of participants and the sheer complexity. It was the largest oil supply cut in history. Nothing like this had ever happened before in the world of oil, and certainly not with the United States at the center of it. "

― Daniel Yergin , The New Map: Energy, Climate, and the Clash of Nations